I think the rear are so easy to change that no DIY is necessary. Take out all the stuff from the trunk. You will see the air lines go into the springs. Disconnect battery, remove air line, unbolt the sucker, and replace.

I think Arnotts part numbers are correct.

If you look at this link, part number 37116761444 is for the 4.8is.
New RIGHT Front Air Spring for 2000-2006 (w/ 4 corner air leveling ONLY) X5

__________________
2006 4.8is, Black on White. SOLD Sniff Sniff.

2017 F85 x5m, Black on Red. BEAST MODE


"The older we grow the greater becomes our wonder at how much ignorance one can contain without bursting one's clothes." - Mark Twain

Unlock OBC post 5